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関連する概念動画

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

824
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
824
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.3K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.3K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.9K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.9K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

1.1K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
1.1K
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

1.5K
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
1.5K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.8K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.8K

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関連する実験動画

Updated: Mar 3, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

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回転する固体におけるダイナミックな核極化による電子解離

Edward P Saliba1, Erika L Sesti1, Faith J Scott1

  • 1Department of Chemistry, Washington University in St. Louis , St. Louis, Missouri 63130, United States.

Journal of the American Chemical Society
|April 22, 2017
PubMed
まとめ
この要約は機械生成です。

電子スピン解離は,ダイナミック・ニュクレア・ポラライゼーション (DNP) の極化剤によるパラマグネット効果を軽減することによって,核磁気共振 (NMR) の感性を高める. この技術により信号の強度が向上し バイオモレキュルの線幅が縮小します

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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging

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関連する実験動画

Last Updated: Mar 3, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
09:37

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging

Published on: December 30, 2016

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科学分野:

  • 磁気共鳴スペクトル
  • バイオ物理学

背景:

  • ダイナミックな核偏振 (DNP) は,電子パラマグネティック共振 (EPR) から偏振を移転することによって,核磁気共振 (NMR) の感度を大幅に高めます.
  • パラマグネティックなDNP偏振剤は,リラックス効果のためにNMR信号に負の影響を及ぼします.

研究 の 目的:

  • DNPとマジック・アングル・スピニング NMRスペクトロスコーピーと組み合わせた電子スピン解離を実証する.
  • 電子解離性能に対するマイクロ波周波数とDNP極化時間の影響を調査する.

主な方法:

  • DNP強化のNMR実験で電子スピン解離を実装する.
  • マイクロ波の周波数を利用する タイム・ドメインの戦略として
  • グラス状のマトリックス内のバイオ分子における13Cスピンに適用する.

主要な成果:

  • 電子解離性能はマイクロ波周波数とDNPの極化時間に大きく依存する.
  • 電子分離の効率を大幅に改善する.
  • 線幅の11%の減少 (47 Hz) と13C回転の14%の強度の増加が観察されました.

結論:

  • 電子スピン解離は,DNP強化のNMRにおけるパラマグネティック・リラクゼーション効果を緩和する効果的な方法である.
  • 開発されたタイム・ドメイン戦略は,分離効率を大幅に改善します.
  • この技術は,生物分子NMRの研究のスペクトル品質を高めます.